libuci.c

   1 /*
   2  * libuci - Library for the Unified Configuration Interface
   3  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 /*
  16  * This file contains some common code for the uci library
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <sys/types.h>
  21 #include <stdbool.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include "uci.h"
  26 #include "err.h"
  27
  28 static const char *uci_confdir = UCI_CONFDIR;
  29 static const char *uci_savedir = UCI_SAVEDIR;
  30
  31 static const char *uci_errstr[] = {
  32         [UCI_OK] =            "Success",
  33         [UCI_ERR_MEM] =       "Out of memory",
  34         [UCI_ERR_INVAL] =     "Invalid argument",
  35         [UCI_ERR_NOTFOUND] =  "Entry not found",
  36         [UCI_ERR_IO] =        "I/O error",
  37         [UCI_ERR_PARSE] =     "Parse error",
  38         [UCI_ERR_DUPLICATE] = "Duplicate entry",
  39         [UCI_ERR_UNKNOWN] =   "Unknown error",
  40 };
  41
  42 static void uci_cleanup(struct uci_context *ctx);
  43
  44 #include "uci_internal.h"
  45 #include "util.c"
  46 #include "list.c"
  47 #include "history.c"
  48 #include "file.c"
  49
  50 /* exported functions */
  51 struct uci_context *uci_alloc_context(void)
  52 {
  53         struct uci_context *ctx;
  54
  55         ctx = (struct uci_context *) malloc(sizeof(struct uci_context));
  56         memset(ctx, 0, sizeof(struct uci_context));
  57         uci_list_init(&ctx->root);
  58         uci_list_init(&ctx->history_path);
  59         uci_list_init(&ctx->backends);
  60         ctx->flags = UCI_FLAG_STRICT;
  61
  62         ctx->confdir = (char *) uci_confdir;
  63         ctx->savedir = (char *) uci_savedir;
  64
  65         uci_list_add(&ctx->backends, &uci_file_backend.e.list);
  66         ctx->backend = &uci_file_backend;
  67
  68         return ctx;
  69 }
  70
  71 void uci_free_context(struct uci_context *ctx)
  72 {
  73         struct uci_element *e, *tmp;
  74
  75         if (ctx->confdir != uci_confdir)
  76                 free(ctx->confdir);
  77         if (ctx->savedir != uci_savedir)
  78                 free(ctx->savedir);
  79
  80         uci_cleanup(ctx);
  81         UCI_TRAP_SAVE(ctx, ignore);
  82         uci_foreach_element_safe(&ctx->root, tmp, e) {
  83                 struct uci_package *p = uci_to_package(e);
  84                 uci_free_package(&p);
  85         }
  86         uci_foreach_element_safe(&ctx->history_path, tmp, e) {
  87                 uci_free_element(e);
  88         }
  89         free(ctx);
  90         UCI_TRAP_RESTORE(ctx);
  91
  92 ignore:
  93         return;
  94 }
  95
  96 int uci_set_confdir(struct uci_context *ctx, const char *dir)
  97 {
  98         char *cdir;
  99
 100         UCI_HANDLE_ERR(ctx);
 101         UCI_ASSERT(ctx, dir != NULL);
 102
 103         cdir = uci_strdup(ctx, dir);
 104         if (ctx->confdir != uci_confdir)
 105                 free(ctx->confdir);
 106         ctx->confdir = cdir;
 107         return 0;
 108 }
 109
 110 static void uci_cleanup(struct uci_context *ctx)
 111 {
 112         struct uci_parse_context *pctx;
 113
 114         if (ctx->buf) {
 115                 free(ctx->buf);
 116                 ctx->buf = NULL;
 117                 ctx->bufsz = 0;
 118         }
 119
 120         pctx = ctx->pctx;
 121         if (!pctx)
 122                 return;
 123
 124         ctx->pctx = NULL;
 125         if (pctx->package)
 126                 uci_free_package(&pctx->package);
 127
 128         if (pctx->buf)
 129                 free(pctx->buf);
 130
 131         free(pctx);
 132 }
 133
 134 void uci_perror(struct uci_context *ctx, const char *prefix)
 135 {
 136         int err;
 137
 138         if (!ctx)
 139                 err = UCI_ERR_INVAL;
 140         else
 141                 err = ctx->errno;
 142
 143         if ((err < 0) || (err >= UCI_ERR_LAST))
 144                 err = UCI_ERR_UNKNOWN;
 145
 146         if (prefix)
 147                 fprintf(stderr, "%s: ", prefix);
 148         if (ctx->func)
 149                 fprintf(stderr, "%s: ", ctx->func);
 150
 151         switch (err) {
 152         case UCI_ERR_PARSE:
 153                 if (ctx->pctx) {
 154                         fprintf(stderr, "%s (%s) at line %d, byte %d\n", uci_errstr[err], (ctx->pctx->reason ? ctx->pctx->reason : "unknown"), ctx->pctx->line, ctx->pctx->byte);
 155                         break;
 156                 }
 157                 /* fall through */
 158         default:
 159                 fprintf(stderr, "%s\n", uci_errstr[err]);
 160                 break;
 161         }
 162 }
 163
 164 int uci_list_configs(struct uci_context *ctx, char ***list)
 165 {
 166         UCI_HANDLE_ERR(ctx);
 167         UCI_ASSERT(ctx, list != NULL);
 168         UCI_ASSERT(ctx, ctx->backend && ctx->backend->list_configs);
 169         *list = ctx->backend->list_configs(ctx);
 170         return 0;
 171 }
 172
 173 int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 174 {
 175         struct uci_package *p;
 176         UCI_HANDLE_ERR(ctx);
 177         UCI_ASSERT(ctx, package != NULL);
 178         p = *package;
 179         UCI_ASSERT(ctx, p != NULL);
 180         UCI_ASSERT(ctx, p->backend && p->backend->commit);
 181         p->backend->commit(ctx, package, overwrite);
 182         return 0;
 183 }
 184
 185 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
 186 {
 187         struct uci_package *p;
 188         UCI_HANDLE_ERR(ctx);
 189         UCI_ASSERT(ctx, ctx->backend && ctx->backend->load);
 190         p = ctx->backend->load(ctx, name);
 191         if (package)
 192                 *package = p;
 193
 194         return 0;
 195 }
 196
 197 int uci_set_backend(struct uci_context *ctx, const char *name)
 198 {
 199         struct uci_element *e;
 200
 201         UCI_HANDLE_ERR(ctx);
 202         UCI_ASSERT(ctx, name != NULL);
 203         e = uci_lookup_list(&ctx->backends, name);
 204         if (!e)
 205                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 206         ctx->backend = uci_to_backend(e);
 207         return 0;
 208 }